Yup, only pain about picking up one NIB is that it will need to be tapped on one side for the detent threads. That's a slight bit beyond my expertise so hopefully I can track down a shop/machinist to do it without too much hassle/cost.

It's quite easy, install an old bolt if you have one laying around, press or use a sand hammer to install feedneck. Remove bolt. Get a Q size drill bit, center in detent hole in body, drill through the feedneck. Then use a 3/8"-24 tap..... since the body already has threads it'll help guide you in.